Storage system and its access control method

Inactive Publication Date: 2005-05-05
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] In order to solve the above conventional problem, an object of the invention is to provide a storage system, forming a logical storage device by a group of sever

Problems solved by technology

This storage system having such redundancy has such a problem that volume required by each physical storage device is increased according as store data is increased in size, also accompanied by increase in cost.
The above-mentioned conventional techniques, however, have the following problems.
The conventional storage system has a problem of hindering efficient assignment of physical storage devices because there necessarily exists some physical storage device for storing write data with respect to an

Method used

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  • Storage system and its access control method
  • Storage system and its access control method
  • Storage system and its access control method

Examples

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Embodiment Construction

[0042] The preferred embodiment of the present invention will be discussed hereinafter in detail with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be obvious, however, to those skilled in the art that the present invention may be practiced without these specific details. In other instance, well-known structures are not shown in detail in order to unnecessary obscure the present invention.

[0043] Hereinafter, a preferred embodiment of the invention will be described with reference to the drawings.

Structure of the Embodiment

[0044]FIG. 1 is a block diagram showing the structure of a storage system according to a preferred embodiment of the invention.

[0045] A storage system 100 of the embodiment comprises a physical storage space 102, a logical storage device 104, a physical storage control table 211, a data arrangement pattern record table 2...

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Abstract

A storage system configuring a logical storage device by dividing an area on a physical storage space formed by a group of several physical storage devices by the unit of physical block having a certain block length and by assigning the physical storage space in every physical block, comprises a logical storage control table which records identification information indicating whether a physical block is assigned to data or operation is bound to data created from a predetermined data arrangement pattern in every area on the logical storage device, and a data writing unit which, upon receipt of a request of writing data into an area of the logical storage device, when a data arrangement pattern of the writing request agrees with a previously-registered data arrangement pattern, records the identification information of the same data arrangement pattern into the logical storage control table correspondingly to the writing-requested area and abandons the writing request data.

Description

BACKGROUNDS OF THE INVENTION [0001] b 1. Field of the Invention [0002] The present invention relates to a storage system configuring a logical storage device by dividing the area on a physical storage space formed by a group of several physical storage devices by the unit of physical block having a certain block length and by assigning the physical storage space in every physical block, and more particularly to a storage system and its access control method for improving efficiency of assignment of physical storage devices. [0003] 2. Description of the Related Art [0004] Heretofore, there has been such a storage system as forming a logical storage device by a group of several physical storage devices, like a disk array device represented by RAID (Redundant Arrays of Inexpensive / Independent Disks). Data to be stored in the logical storage device on this storage system will be dispersed and stored in each storage area on several physical storage devices. [0005] Holding a table for bri...

Claims

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Application Information

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IPC IPC(8): G06F12/00G06F12/08G06F3/06
CPCG06F3/0608G06F3/0689G06F3/064
Inventor OHTANI, HIROYUKI
Owner NEC CORP
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